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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d129be7a6f3b4fa19a3ff24f00396d161e8d0f67109a1926f05292a9a3678b3' 
  AND token = 'TBbcR017J7J4QaUmfQd5MPzD/kUoXJUrlWX7jUpZFPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}